Trying to dial in new set up in my malibu car is a 383 500+/- hp.... I run 1/8th mile 4.56 gear 28 tall tire shift at 6400rpm and I'm crossing finish line at 6400 at 97mph my Trans is powerglide leaving on tbrake with a convertor that has a true stall of 5200 this same convertor was in my other combo which was a 355 shifting at 6200 and it had a stall of 4300 same Trans same everything crossing traps at 5400-5500 at 91mph just looking for opinions if I'm loosing to much efficiency or if my convertor is where it should be car is deadly consistent all the way from start to finish .....